Stepping through my PHP-Code [Newbie]

Hi Community,

regrets for asking dumb Newbie-questions. Today is my first PHPStorm day.

When I start run > debug, some messages appear in the debug-window, my browser ist started and the output of my PHP-code is shown there. But I can't step through my code with F7, F8, I can't examine variables and the execution doesn't stop at breakpoints.

What have I done wrong?

--
Bfn
Michael